Yen gains as G20 in focus, weak Europe dampens shares

The meeting in Moscow of finance officials from the Group of 20 nations, which account for 90 percent of the world's economy, is set to be dominated by sparring over the motives behind expansive economic policies that have driven currency moves.

Uncertainty over the meeting's outcome saw traders cut short yen positions on Friday, sending the Japanese unit up 0.5 percent against the dollar to 92.40 yen and the euro down to a two-week low of 123.10 yen.